Near as I can tell it’s a generalized fear they are attempting to address this way, and don’t often really fully understand it or why they are even doing it.
If you think of it however as not needing to be rational, but more or from an evolutionary perspective ‘folks in the past who had similar types of fears and discomfort might have survived prior insane disasters that no one else expected to ever occur’ it might make more sense.
It doesn’t have to be rational. It doesn’t even have to help them survive or be successful most of the time. If it works even a little better and they survive when everyone else died because of their insane paranoia, those genes will propagate.
If you think of it however as not needing to be rational, but more or from an evolutionary perspective ‘folks in the past who had similar types of fears and discomfort might have survived prior insane disasters that no one else expected to ever occur’ it might make more sense.
It doesn’t have to be rational. It doesn’t even have to help them survive or be successful most of the time. If it works even a little better and they survive when everyone else died because of their insane paranoia, those genes will propagate.